JPS5815053A - Manufacture of cement product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The purpose of this invention is to significantly improve the properties (workability of troweling, etc.).

Concerning the cement mixtures used in the production of cement products such as 1 mortar, i.e., mixtures consisting of mate, sand and/or fine aggregate, water, etc., there have been several efforts to improve workability. It is being carried out frequently.

For example, dodecylbenzene sulfo y
@ Adding surfactants such as nattocum and sodium oleate I: Attempts have been made to further improve the workability, but adding such surfactants will cause problems if the application is mortar etc. It has the disadvantage of causing problems in adhesion to the base and in finishing with eyelids. In addition, to improve workability, Asagijo etc. are also added to the mixture.
In this case, it will not be effective unless the mixing ratio of the light yellow layer is increased, and adding this large amount will inevitably increase the water/cement ratio, which has the disadvantage of causing further shrinkage, etc. In some cases, a major general construction company prohibits the use of this combination of light yellow tops other than mortar applied to the lath base.On the other hand, cellulose ether, AI agents, etc. are used as water reducing agents and water retaining agents, but they are difficult to work with. It is not necessarily satisfactory in this respect.

In general, increasing the water/cement ratio, cement ratio/sand settling, etc. improves the workability of trowel slipping, but this not only increases sag but also increases drying shrinkage, which can cause graining and cracking. Become.

In this way, placing importance on workability often has a negative impact on mortar performance such as adhesion and hardness, and there has been a strong desire to develop a manufacturing method for cement products that solves both of these problems. .

The present inventors have extensively studied additives to solve this technical problem, and have found that a small amount of fine particles of Gairome clay, which is widely used in the manufacture of ceramics, etc., can be incorporated into a cement-based mixed material. By adding a small amount of water-soluble cellulose ether to these clays, the workability (edge workability, etc.) of the clay itself is significantly improved without the disadvantages mentioned above, and water retention and adhesive properties are improved. It was confirmed that further improvements could be made, and the present invention was completed.

To explain this, the Gairome clay used in the present invention,
Honbushi clay is widely produced mainly in the Seto region and is used in the manufacture of ceramics.It is generally composed of particles of 100μ or less in size that have been treated with water to remove coarse particles. is preferable, but those containing a large amount of coarse particles have a weak addition effect and not only increases the amount added, but also increases the water/cement ratio, which is undesirable as it can cause cracks, etc. Therefore, this particle is It is preferable that the particles be fine, and it is particularly preferable that 80% or more of the particles are α1 to 50μ.

This diagonal clay, Honbushi clay is cement) 100 weight wA
It is used in an addition amount of 0.2 to 10 parts by weight (preferably 0.5 to 8]l amount II), and in the case of fine particles, α2
~3 parts by weight, if the surface is relatively rough, use 1 to 10 parts by weight; if you require smoothness of the surface, use a slightly larger amount; if you simply want to improve workability, use a relatively large amount. It is desirable to add a small amount.

These clays can be added by dispersing them in water in advance, or by adding and kneading mixed test water with cement, sand, silica sand, etc.

Incidentally, the cement/sand ratio is not particularly limited and may be within the range normally used, but is generally set to sand/cement ratios 1 to 3. The water/cement ratio also depends on the sand/cement ratio, sand particle size, and the presence or absence of additives.

Generally, the water/cement ratio may be increased by 10% by weight or less compared to when the clay is not used.

On the other hand, in the present invention, when water retention and adhesiveness are required, water-soluble cellulose ether is added together with the clay. As this cellulose ether, hydroxyethyl methyl cellulose, hydroxylethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, hydroxyethylethyl cellulose, etc. are used.

The amount of these cellulose ethers added is 0.00% per 100 parts by weight of cellulose ether. O1~0. It is desirable to add s parts by weight. In addition, when the base is a little dry.

Alternatively, when the temperature is high, it is desirable to add it to the rows.

In carrying out the present invention, there is no problem in adding various other additives to the cement mixture.
Examples of these include water reducing agents, antifoaming agents, retarders, accelerators, water retaining agents, water fat agents, bulk admixtures, and the like. It is also one of the features of the present invention that even if such various additives are used, the above-mentioned effects of the present invention are not hindered.

Next, specific examples will be given.

Example 1 Various types of mortar mixed with a target slump value of 69a+ were applied to a Gonk dart base to a thickness of 4-4 mm using a metal trowel. The temperature was 20°C, the humidity was 55%, and the base was soaked in water.

When the workability, crack occurrence, and surface smoothness of each solutar were investigated, the results were as shown in Table 1.

Workability: Workability with a trowel was evaluated in three grades: excellent, fair, and fair.

Crack occurrence: The occurrence of cracks was visually judged in the following three stages.

A: No cracks occur. B: Slight occurrence of cracks There is a crack in the OS. Surface smoothness: Judgment was made in the following four stages.

AX Very good smoothness B: Excellent smoothness 0: Smoothness - poor D: Very poor smoothness Abbreviation symbol for used clay Clay] C: Wooden rattan clay Clay G: Kairo Ichimushi (for 1st use) Abbreviation for cellulose ether HPMO:
Hydroxylipropyl methylcellulose HIMO: Human σ-ethyl methylcellulose Example 2 Various types of mortar with a target slump value of 51 were spread on a concrete base using a metal trowel to a thickness of 3.01111. The temperature is 25℃ and the humidity is Ft! So%, and the base was left under the same conditions C: left. However, without watering.

Each mortar has two types, and has been tested for workability, adhesion, and surface smoothness. The results were as shown in section a.

However, for adhesive growth, the following test method was followed.

[Adhesion test method]

Thickness LO using each mortar metal trowel on the groundwork
wmt: @clothed. After that, the mortar was cured and cured at 1i [temperature (20°C)], and after 28 days, the mortar was
1i (Cut until double, mortar * iii, ebok V resin and iron disc II @
The load of the ginseng was determined using a fixed-type tensile tester, and the adhesive strength was determined using the following formula (g).

Procedural amendment (September 24, 1986, Haruki Shimada, Commissioner of the Patent Office of own ship, 1, Indication of the case, Showa S6 Patent ■ No. 111994, 2, Name of the invention, Semey) Product manufacturing method 3, Person making the amendment Name of patent applicant related to the case (!1011) Shin-Etsu Chemical Co., Ltd. 4, agent Address Mizui Building, 4-9 Nihonbashi Honcho, Chuo-ku, Tokyo 103 [Telephone: Tokyo (270) 0858,08
59) Specification 6, amended contents, fiber substances, etc.''

2) Table 2 on page 812 of the specification is amended as shown in the attached sheet.

that's all

Claims (1)

[Claims] Per 100 parts by weight of L.
Alternatively, a method for producing an easy-to-cement product, characterized by forming a cement-based mixed material containing 0.2 to 10 parts by weight of Kibushi clay. 1 Seme and (Ef) water-soluble cellulose ether from 0.01 to
A method for producing a cement product, characterized by forming a cement-based kneaded material containing O0s by weight.